diff --git a/library/composables/usePosterPrints.js b/library/composables/usePosterPrints.js
index 515d2237c..0a9c05a11 100644
--- a/library/composables/usePosterPrints.js
+++ b/library/composables/usePosterPrints.js
@@ -36,6 +36,15 @@ const esc = (s) => String(s ?? '')
   .replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
   .replace(/"/g, '&quot;').replace(/'/g, '&#39;');
 
+// A sheet the host GENERATES (opts.sheet) that fails still falls through to the stored one, so a print never comes
+// out blank. It must not fall through SILENTLY: a stored sheet with an old header once printed in place of the
+// generated one, and nothing said why. The console names the sheet and the reason. An empty result is not a
+// failure: a generator returns '' on purpose when it cannot draw that sheet.
+const generated = (draw, id, format) => Promise.resolve().then(draw).catch((e) => {
+  try { console.warn(`[posterPrints] the ${format} sheet for ${id} could not be generated, so the stored sheet prints instead: ${e?.message || e}`); } catch (_) { /* no console */ }
+  return '';
+});
+
 /**
  * THE PRINT STANDARD — one call gives any map the poster, the card deck, the prayer list and the
  * prayer packet (full or lightweight) for ANY item: a zone, a country, or a custom list of people.
@@ -167,7 +176,7 @@ export function usePosterPrints(opts = {}) {
       // that cannot generate, and a generation that fails falls through to them rather than to nothing.
       if (opts.sheet) {
         set(item, kind, 'render', tr('wall.hud.generatingPoster', 'generating the poster'), 35);
-        const html = await Promise.resolve().then(() => opts.sheet(item, 'letter')).catch(() => '');
+        const html = await generated(() => opts.sheet(item, 'letter'), id, 'letter');
         if (html) {
           set(item, kind, 'save', tr('wall.hud.openingPrint', 'opening the print dialog'), 80);
           await deliver(html, item, kind);
@@ -413,7 +422,7 @@ export function usePosterPrints(opts = {}) {
       const mapId = item && 'mapId' in item ? item.mapId : item?.id;
       if (!mapSvg && opts.sheet && mapId) {
         const target = mapId === item?.id ? item : { ...item, id: mapId };
-        const html = await Promise.resolve().then(() => opts.sheet(target, 'packet')).catch(() => '');
+        const html = await generated(() => opts.sheet(target, 'packet'), mapId, 'packet');
         if (html) mapSvg = R.liftMap(html, { labelFor: await mapLabelFor() });
       }
       if (!mapSvg && opts.mapImage) {